title: Fenestration of the superior medullary velum as treatment for a trapped fourth ventricle: a feasibility study.
mesh_terms: D000368:Aged; D002102:Cadaver; D002557:Cerebrospinal Fluid Shunts / Q000009:adverse effects*; D004724:Endoscopy / Q000379:methods*; D005260:Female; D020546:Fourth Ventricle / Q000473:pathology* / Q000601:surgery*; D006801:Humans; D006849:Hydrocephalus / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D019635:Neurosurgical Procedures / Q000379:methods*; D013346:Subarachnoid Space